function A = plotpdump(stop, coord)
 hold on;
for i=1:70:(stop-1)
    [filename,err] = sprintf('p_dump_%d.dat', i);
    A = load(filename);
    plot(A(:,1), A(:,coord),'rx');
    %ylim([-2e8 2e8]);
    xlim([0 100]);
   
    pause(0.01);
end

hold off
